using System;
using Godot;

public partial class Meeting : RigidBody2D
{
    private bool _mouseInside;
    private bool _isDragging;
    private Vector2 _dragTarget;

    public override void _Ready()
    {
        FreezeMode = FreezeModeEnum.Kinematic;

        MouseEntered += () =>
        {
            _mouseInside = true;
            CanSleep = false;
        };
        MouseExited += () =>
        {
            _mouseInside = false;
            CanSleep = true;
        };
    }

    public override void _UnhandledInput(InputEvent @event)
    {
        // TODO: probably memory problem
        if (@event is InputEventMouse mouseEvent)
        {
            if (_mouseInside)
            {
                if (mouseEvent.IsPressed() && mouseEvent.ButtonMask == MouseButtonMask.Left)
                {
                    GD.Print("Start Dragging");
                    StartDragging();
                }
            }
        }

        if (_isDragging && @event is InputEventMouseButton { Pressed: false })
        {
            GD.Print("Let me free");
            StopDragging();
        }
    }

    public override void _PhysicsProcess(double delta)
    {
        _dragTarget = GetGlobalMousePosition();
    }

    public override void _IntegrateForces(PhysicsDirectBodyState2D state)
    {
        if (!_isDragging)
            return;

        var t = state.Transform;
        t.Origin = _dragTarget;

        state.Transform = t;
        state.LinearVelocity = Vector2.Zero;
        state.AngularVelocity = 0;
    }

    private void StartDragging()
    {
        Freeze = true;
        _isDragging = true;
        CollisionLayer = 0;
    }

    private void StopDragging()
    {
        Freeze = false;
        _isDragging = false;
        CollisionLayer = 1;
    }
}